1. The problem statement, all variables and given/known data Verbatim from the book: A square loop is cut out of a thick sheet of aluminum. It is then placed so that the top portion is in a uniform magnetic field B, and allowed to fall under gravity. (In the diagram, shading indicates the field region; B points into the page.) If the magnetic field is 1 Tesla, find the terminal velocity of the loop (in m/s). Find the velocity of the loop as a function of time. How long does it take (in seconds) to reach, say, 90% of the terminal velocity? What would happen if you cut a tiny slit in the ring, breaking the circuit? I've attached a reproduction of the diagram. 2. Relevant equations Lorentz force law (perhaps?): F = q(E + B x v) 3. The attempt at a solution I'm completely stumped, not even sure where to start. It doesn't make sense to talk about terminal velocity unless there's some force resisting the motion of the loop. However, as far as I can tell, there is none. The loop will simply drop out of the field region, and subsequently only experience a force due to gravity (i.e., no terminal velocity). Link to diagram.